Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.47
Process Start Time: Mon Jun 29 14:47:28 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger976692
======================================================================
Trigger: 00976692 Segment: 000
BAT Trigger Time: 613330144 [s; MET]
Trigger Stop: 613330208 [s; MET]
UTC: 2020-06-08T17:28:38.919540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 309.628863589921 Dec: -31.1682990251738 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.43
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.43
Analysis Position: [ source = BAT ]
RA: 309.628863589921 Dec: -31.1682990251738 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 309.624692527112 Dec: -31.1904932972864 [deg; J2000]
{ 20h 38m 29.9s , -31d 11' 25.8" }
+/- 2.43695300538833 [arcmin] (estimated 90% radius based on SNR)
+/- 1.14280529885613 [arcmin] (formal 1-sigma fit error)
SNR: 8.52078462810548
Angular difference between the analysis and refined position is 1.348760 arcmin
Partial Coding Fraction: 0.5390625 [ including projection effects ]
Duration
T90: 121.552000045776 +/- 33.0062664770605
Measured from: 20.6480000019073
to: 142.200000047684 [s; relative to TRIGTIME]
T50: 53.37600004673 +/- 17.7610739340572
Measured from: 31.4479999542236
to: 84.8240000009537 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 67.8040000200272
to: 68.8040000200272 [s; relative to TRIGTIME]
Total Fluence
Measured from: 18.3279999494553
to: 161.175999999046 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.919689 1.033562 0.521118 0.083763
0.123890 0.113356 0.095174 0.081632 [error]
Peak 0.043293 0.032764 0.008715 0.007435
0.010858 0.009966 0.007870 0.006556 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 142.848 18.328 161.176
T90 121.552 20.648 142.200
T50 53.376 31.448 84.824
Peak 1.000 67.804 68.804
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_index}
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -2.037 -0.237 0.224 - - - 1.08e-03 -1.71e-04 1.68e-04 63.750 57
CPL -0.607 -1.091 1.421 39.936 -11.958 12.386 7.30e-03 -7.30e-03 4.21e-02 58.400 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -2.443 -0.689 0.571 - - - 4.15e-03 -1.96e-03 1.99e-03 44.390 57
CPL -1.000 N/A N/A 80.000 N/A N/A 1.01e-02 N/A N/A 50.000 56
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence PL 3.28e-07 4.35e-07 4.24e-07 7.39e-07 1.43e-06 1.93e-06 erg/cm2
90%_error_low -5.85e-08 -5.62e-08 -8.82e-08 -2.64e-07 -2.09e-07 -3.78e-07 erg/cm2
90%_error_hi 6.04e-08 5.61e-08 9.05e-08 3.47e-07 2.14e-07 4.37e-07 erg/cm2
Peak flux PL 4.26e-01 2.47e-01 9.07e-02 4.40e-02 7.87e-01 8.08e-01 ph/cm2/s
90%_error_low -1.70e-01 -8.74e-02 -5.02e-02 -4.40e-02 -2.63e-01 -2.70e-01 ph/cm2/s
90%_error_hi 1.78e-01 8.61e-02 5.99e-02 6.80e-02 2.63e-01 2.70e-01 ph/cm2/s
Fluence CPL 2.89e-07 5.08e-07 3.88e-07 1.05e-07 1.27e-06 1.29e-06 erg/cm2
90%_error_low -6.85e-08 -7.84e-08 -1.18e-07 -8.31e-08 -2.09e-07 -2.27e-07 erg/cm2
90%_error_hi 6.86e-08 8.10e-08 1.11e-07 3.15e-07 2.33e-07 3.71e-07 erg/cm2
Peak flux CPL 4.09e-01 3.23e-01 1.70e-02 8.46e-06 7.50e-01 7.50e-01 ph/cm2/s
90%_error_low -1.88e-01 N/A -1.70e-02 -8.46e-06 -2.56e-01 -2.57e-01 ph/cm2/s
90%_error_hi 2.03e-01 N/A 9.65e-02 2.53e-02 2.57e-01 2.57e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 309.6247 -31.1905 0.0224 35.7172 -145.3465 2.2556127 8.521 TRIG_00976692 Foreground time interval of the image: 18.328 161.176 (delta_t = 142.848 [sec]) Background time interval of the image: -239.000 18.328 (delta_t = 257.328 [sec])
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from 18.328 sec. to 161.176 sec. XSPEC12>exit XSPEC: quit Photon index: -2.03697 ( -0.236498 0.22386 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 2.03697 ( -0.22386 0.236498 ) Norm@50keV : 1.08313E-03 ( -0.000171268 0.000167917 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 142.8 sec: 0.165308 ( -0.02151 0.021534 ) ph/cm2/s Energy fluence (15-150 keV) : 1.42981e-06 ( -2.0948e-07 2.13567e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 18.328 sec. to 161.176 sec. XSPEC: quit Photon index: -0.607194 ( -1.09281 1.41895 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.607194 ( -1.41895 1.09281 ) Epeak [keV] : 39.9361 ( -11.9574 12.3865 ) Norm@50keV : 7.30349E-03 ( -0.00732737 0.0420911 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 142.8 sec: 0.157351 ( -0.022172 0.022262 ) ph/cm2/s Energy fluence (15-150 keV) : 1.27036e-06 ( -2.09455e-07 2.32771e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 67.804 sec. to 68.804 sec. XSPEC12>exit XSPEC: quit Photon index: -2.44294 ( -0.686031 0.574285 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 2.44294 ( -0.574285 0.686031 ) Norm@50keV : 4.14740E-03 ( -0.00195517 0.00199545 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 0.787236 ( -0.262658 0.262734 ) ph/cm2/s Energy fluence (15-150 keV) : 4.0846e-08 ( -1.52619e-08 1.64481e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 67.804 sec. to 68.804 sec. XSPEC: quit Photon index: -1 ( ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.00000 ( ) Epeak [keV] : 80.0000 ( ) Norm@50keV : 1.00528E-02 ( ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 0.749639 ( -0.255805 0.257441 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 121.552 sec. Hardness ratio (energy fluence ratio) = 0.974720274471
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 7.62811e-07 S(50-150 keV) = 6.67016e-07
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
IMX = -5.914756500014403E-01, IMY = 4.088477922777994E-01
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -239.000000 18.328000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9690 -15.6300 0.5 25.0 43.5 8.1741 22.4 0.9 Sco X-1 255.7603 -37.7311 0.0 14.6 -26.9 -0.0098 -0.0 12.7 4U 1700-377 256.4051 -36.3967 2.7 13.3 -23.8 1.3059 4.3 2.2 GX 349+2 262.8682 -24.8406 10.8 5.9 48.6 0.3082 1.1 9.6 GX 1+4 264.9534 -44.4993 11.8 16.9 -62.1 0.3355 1.0 9.5 4U 1735-44 268.3050 -1.3167 12.9 26.5 108.6 -0.3897 -0.9 9.0 SW J1753.5-0127 270.2839 -25.2070 3.3 3.1 140.2 1.2697 4.6 7.7 GX 5-1 270.3203 -25.6216 4.3 2.8 145.2 1.1134 4.0 7.4 GRS 1758-258 274.0358 -14.0873 4.9 14.7 130.6 0.7603 2.4 3.5 GX 17+2 276.0858 -30.3115 6.1 7.0 -138.7 0.5690 1.9 9.0 H1820-303 284.8184 -24.8577 0.0 14.9 -168.8 0.1412 0.5 12.4 HT1900.1-2455 288.9036 10.9057 10.3 43.5 138.9 1.1250 1.1 6.6 GRS 1915+105 262.9626 -33.8535 2.9 7.7 -33.8 1.1872 4.0 1.7 GX 354-0 325.7689 -40.8739 4.6 48.1 -129.6 3.6132 2.5 ------ UNKNOWN 229.0550 -69.2031 3.9 47.2 -53.0 4.2150 3.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 18.328000 161.176000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.8146 -15.5305 0.0 25.2 43.5 -0.2664 -1.2 11.6 Sco X-1 256.0015 -37.7038 3.4 14.4 -27.3 -0.6106 -3.4 8.4 4U 1700-377 256.3135 -36.5937 18.6 13.5 -24.3 -0.1101 -0.6 11.8 GX 349+2 262.8899 -24.6219 19.1 6.0 50.5 -0.1070 -0.6 9.9 GX 1+4 264.9949 -44.5345 4.5 16.9 -62.2 -0.5050 -2.6 11.9 4U 1735-44 268.2003 -1.3954 3.0 26.5 108.4 0.9210 3.9 10.6 SW J1753.5-0127 270.4621 -25.0838 6.6 3.3 141.6 -0.3037 -1.7 9.7 GX 5-1 270.4604 -25.7598 3.9 2.7 149.0 -0.5276 -3.1 8.6 GRS 1758-258 274.1014 -13.8735 7.2 14.9 130.6 -0.3059 -1.6 11.2 GX 17+2 275.8009 -30.2500 6.1 6.8 -138.6 0.3345 1.9 9.5 H1820-303 284.9560 -24.7947 13.8 15.0 -168.9 0.1424 0.8 8.7 HT1900.1-2455 288.8523 10.9092 7.4 43.5 138.8 -0.8100 -1.6 3.9 GRS 1915+105 262.8434 -33.9532 4.7 7.8 -33.7 -0.4336 -2.5 10.2 GX 354-0 245.5332 6.5816 3.0 41.0 72.8 3.1336 3.9 ------ UNKNOWN 205.6401 -32.7550 2.2 53.7 -2.7 2.5547 5.2 ------ UNKNOWN 309.6247 -31.1905 1.3 35.7 -145.3 2.2557 8.5 ------ UNKNOWN 328.7283 -17.4228 1.9 56.0 -157.9 5.3357 6.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 845.200600 963.119700 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.4932 -60.6823 4.4 55.9 -3.6 -1.5119 -2.6 6.3 Cen X-3 186.6515 -62.7561 3.2 50.1 3.1 1.4181 3.6 0.9 GX 301-2 255.9677 -37.6858 14.3 36.9 73.0 0.3531 0.8 9.5 4U 1700-377 256.3659 -36.4348 208.2 37.7 74.7 0.0264 0.1 3.4 GX 349+2 264.7359 -44.4501 89.9 27.5 73.1 0.0331 0.1 0.3 4U 1735-44 270.2867 -25.2593 0.0 40.4 100.4 0.8070 1.3 10.8 GX 5-1 270.2895 -25.6527 5.4 40.0 100.1 1.3505 2.2 5.5 GRS 1758-258 275.9087 -30.3081 9.4 33.6 104.0 0.3672 1.2 3.6 H1820-303 284.9624 -24.8830 19.3 35.7 120.7 -0.2104 -0.6 4.6 HT1900.1-2455 262.9000 -33.8796 12.7 36.4 84.3 0.3828 0.9 5.2 GX 354-0 252.5182 -35.3359 2.9 40.5 72.0 2.5451 4.0 ------ UNKNOWN 289.2890 -27.4603 2.2 32.1 126.1 1.3232 5.1 ------ UNKNOWN 173.6185 -60.6377 2.8 55.2 -1.9 2.0952 4.1 ------ UNKNOWN 164.6679 -83.2990 2.5 37.4 -21.8 0.9415 4.6 ------ UNKNOWN 352.2885 -48.6910 2.8 29.6 -115.8 0.9714 4.2 ------ UNKNOWN